They both use numbers to grade their bolts – the higher the number, the higher the tensile strength. For instance, the SAE system covers diameters of up to 1 ½ inch, and a grade 8 would have a higher tensile strength than a grade 5.
What grade of bolt is high tensile?
High tensile steel bolts
Grade 8.8 high tensile steel is often referred to as the structural grade for bolts. It is the most common form of high tensile material and is usually stocked in plain finish or zinc.
How would you differentiate between a high tensile bolt and an ordinary bolt?
Ordinary bolts are generally made of ordinary steel (Q235) and only need to be tightened. Ordinary bolts are generally 4.4, 4.8, 5.6 and 8.8 class. High-strength bolts are generally 8.8 and 10.9 class, of which 10.9 class are mostly. The screw holes of ordinary bolts are not necessarily larger than high-strength bolts.
What is a high strength bolt identified by?
Any grades on our Strength Requirements by Grade Chart with a “Q & T” in the Material & Treatment Column undergo heat treatment and would be considered high strength by most people in the fastener industry. Both SAE J429 Grades 5 and 8 have been quenched and tempered and would be considered “high strength” by most.
What is high tension bolt?
High Tensile Hex Bolt is used in applications which have high stress on the fasteners. When connecting two parts together, the tensile stress forced on the fastener can break it. … The ordinary 304 stainless steel has tensile strength of 515MPa.
How do you tell what grade a bolt is?
You can usually figure out the grade, or strength, of a bolt by looking at the markings on its head. English bolts (U.S.S. or S.A.E) are categorized by grade, from grade 2 to grade 8, where the grade represents inch strength. The higher the grade, the stronger the bolt.
Are stainless steel bolts high tensile?
Stainless steel fasteners available on the Australian market in the main are equal to or higher in tensile strength than the carbon and low alloy steel fasteners commercially used, and are higher strength than most other corrosion resistant fasteners.
What’s the difference between 4.6 and 8.8 bolts?
Category 4.6/S refers to commercial bolts of Property Class 4.6 conforming to AS 1111.1 tightened using a standard wrench to a ‘snug-tight’ condition. Category 8.8/S refers to any bolt of Property Class 8.8, tightened using a standard wrench to a ‘snug- tight’ condition in the same way as for category 4.6/S.
What is a high tensile bolt used for?
High tensile bolts are used for high-stress fastening applications. For example, you would usually require high tensile bolts in the realms of construction or other similar industrial environments. These high tensile bolts help to secure heavy objects together and shoulder their weight for many years, or even decades.
Which bolts are high strength bolts?
Grade 9 structural bolts, also known as grade 9 hex cap screws, are one the strongest structural bolts that can be used today. While the typical grade 8 bolt has a tensile strength of 150,000 PSI, a grade 9 bolt has a tensile strength of 180,000PSI.
Are high strength bolts stronger than common bolts?
The core difference between high strength bolt and common bolt is not the strength of the material used, but the form of stress.
What grade is the strongest bolt?
Commercial-grade 8 bolts are the strongest option available. They’re made from medium carbon alloy steel and have markings that include six raised dashes. The psi of the bolt is 150,000, meaning that it can withstand great deals of pressure because of the way it was quenched and tempered.
Is a Grade 8 bolt stronger than a Grade 5?
Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions.
Are high tensile bolts stronger?
High Tensile is strongest under tension – ie when it is bolted tight, it will clamp your bar to your chassis. Whether it is stronger for shearing (sideways) forces depends on the grade of the HT vs the grade of stainless.
What is high tensile?
High tensile steel is a kind of mild carbon steel which has a high yield strength and tensile strength. It contains distinctive alloying components so as to build the tensile strength of the steel. … Strength: Strength of material is the capacity to oppose force, weight or stress.
Are high tensile bolts rust proof?
High tensile steel bolts, on the other hand, are not at risk of bimetallic corrosion with your engine block. A well lubricated and maintained engine will keep your high tensile bolts as good as new. You will also be able to rest assured that the bolts will not break due to tension forces from your engine’s operation.